public ActionResult Details(int?id)
        {
            if (id == null)
            {
                return(new HttpStatusCodeResult(HttpStatusCode.BadRequest));
            }

            SiteUser SiteUser = SiteUserManager.Find(x => x.Id == id.Value);

            if (SiteUser == null)
            {
                return(HttpNotFound());
            }

            return(View(SiteUser));
        }